CVE-2020-11939: Ntop Ndpi

Critical severity, CVSS 9.8. EPSS: 3.3% chance of exploitation in the next 30 days.

In nDPI through 3.2 Stable, the SSH protocol dissector has multiple KEXINIT integer overflows that result in a controlled remote heap overflow in concat_hash_string in ssh.c. Due to the granular nature of the overflow primitive and the ability to control both the contents and layout of the nDPI library's heap memory through remote input, this vulnerability may be abused to achieve full Remote Code Execution against any network inspection stack that is linked against nDPI and uses it to perform network traffic analysis.

Affected products

• Ntop Ndpi: up to and including 3.2

Published 2020-04-23. Last modified 2026-06-17.